New Infrared Bands of the C-Bonded Isomer of OC-NO and Determination of Two Intermolecular Frequencies.

Three combination bands involving intermolecular modes of the most stable isomer of the OC-NO van der Waals complex have been observed, two in the carbon monoxide CO stretch region (∼2150 cm) and one in the ν asymmetric stretch region of NO (∼2223 cm). Vibrational assignment is achieved by comparison with data recently published ( Barclay , A. ; et al. Chem. Phys. Lett. 2016 , 62 , 651 ), concerning OC-CO. Two of these bands involve the same intermolecular mode, one with the CO stretch and the other with the ν asymmetric stretch of NO. The values of intermolecular frequency deduced from these two bands agree very well, showing no significant dependence on intramolecular vibrational excitation.